引气混凝土的抗冻性和气泡结构的关系研究  

Freeze-thaw Resistance and Air-void Characteristics of Air-entraining Concrete

作　　者：杨晶杰[1] 孙兆雄[1] 葛毅雄[1] 于玲[1] 

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《土工基础》2005年第2期76-78,共3页Soil Engineering and Foundation

摘　　要：对不掺加引气剂和掺引气剂的中砂混凝土和细砂混凝土的坍落度、含气量、抗压强度、冻融循环以及硬化混凝土气泡结构进行了试验与测试。试验结果表明,混凝土掺入引气剂后增加了大量微小气泡(直径小于100μm),明显提高了混凝土的抗冻性;当含气量相同时,随着水灰比的增大, 小于100μm 的气泡个数逐渐减少,大于100μm的气泡个数逐渐增多。同时,W/C为0.45或大于0.45时,气泡之间有连通现象,导致引气混凝土的抗冻性逐渐降低;当引气混凝土的气泡间距系数小于200μm 时,混凝土具有较高的抗冻性。In this paper, the slump, air content, compressive strength, freeze-thaw resistance and air-void characteristics of medium sand concrete and fine sand concrete without and with 0.06%-0.08% air entraining agent are presented. The test resuits as follows； Use air entraining agent can obviously increase a lot of small pores in concrete （less 100μm ）, freeze-thaw resistance is also increased; Under the condition of the same air content, when water-content ratio increase, the number of pore diameter of 25μm to 100μm has a tendency to reduce, and the number of pore diameter of 100μm to 600μm has a tendency to increase. When water-cement ratio is 0.45 or higher, air-void has a tendency to link together, the pore diameter increases, so freeze-thaw resistance has a tendency to reduce； Air-void spacing factor of approximately 200#m is useful to protect concrete from freeze-thaw damage.

关 键 词：引气混凝土 抗冻性 气泡结构 引气剂 细砂混凝土 技术性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]